Abstract: Method and device for the detection of an essentially rectilinear contrast edge (E) in a direction, whereby a periodic sweep (?) of global visual angle (??) of the optical sensors, by translation (S) in another direction transverse to the first direction, is carried out. The translation provides a periodic sweep of non-uniform angular speed (?) during a part of the period of sweeping and a measurement of a time difference (t) from the signals provided by the sensors (D1, D2), depending on the angular position of the contrast edge (E) with relation to a reference direction (OY12) within the global visual angle (??) from the sweep law (?), the reference direction being connected to a specific value for the time difference (t). The above is of application to spatial stabilization of a sight line and the fine following and fixing of an object with at least one contrast edge.

Abstract: A steering aid system for altitude and horizontal speed of an aircraft (4) includes: a measuring device (22) for delivering a measured signal based on the aircraft altitude and horizontal speed, a common predetermined reference value (26) for the aircraft altitude and horizontal speed, and elements (20) for slaving the signal to the reference value by pitch loop, the elements being adapted to vary automatically the pitch and/or propulsive performance of the lifting members to lock the measured signal to the reference value.

Abstract: Method and device for the detection of an essentially rectilinear contrast edge (E) in a direction, whereby a periodic sweep (?) of global visual angle (??) of the optical sensors, by translation (S) in another direction transverse to the first direction, is carried out. The translation provides a periodic sweep of non-uniform angular speed (?) during a part of the period of sweeping and a measurement of a time difference (t) from the signals provided by the sensors (D1, D2), depending on the angular position of the contrast edge (E) with relation to a reference direction (OY12) within the global visual angle (??) from the sweep law (?), the reference direction being connected to a specific value for the time difference (t). The above is of application to spatial stabilization of a sight line and the fine following and fixing of an object with at least one contrast edge.

Abstract: A steering aid system for altitude and horizontal speed of an aircraft (4) includes: a measuring device (22) for delivering a measured signal based on the aircraft altitude and horizontal speed, a common predetermined reference value (26) for the aircraft altitude and horizontal speed, and elements (20) for slaving the signal to the reference value by pitch loop, the elements being adapted to vary automatically the pitch and/or propulsive performance of the lifting members to lock the measured signal to the reference value.